High-quality, low-nitrogen bio-oil from kitchen waste via K₂CO₃-catalyzed solvothermal liquefaction in recycled ethanol-water co-solvent.

IF 9 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology Pub Date : 2025-12-01 Epub Date: 2025-08-06 DOI:10.1016/j.biortech.2025.133111

Mi Yan, Linyi Chen, Yu Liu, Hongyu Sun, Haihua Zhang, Rendong Zheng, Yuxuan Ying

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引用次数: 0

Abstract

Kitchen waste (KW), comprising 30 %-60 % of municipal solid waste, could be converted to bio-oil via alkaline-catalyzed solvothermal liquefaction (STL) without energy-intensive drying. This study systematically investigated six catalysts (K₂CO₃, Na₂CO₃, KHCO₃, NaHCO₃, KOH, NaOH) for product distribution and nitrogen migration in STL versus hydrothermal liquefaction (HTL). Results demonstrate K₂CO₃'s superiority in ethanol-water co-solvent, synergistically enhancing bio-oil yield to 57.18 % (calorific value 35.49 MJ/kg) while achieving directional denitrification - reducing nitrogen content to 22.99 wt.% via pH-driven protein deamidation. Sulfur content decreased to 0.13 wt.% through sulfide decomposition. Critically, this method optimized bio-oil composition: light fractions (<343 °C) reached 82.10 % and hydrocarbons increased to 14.47 %, significantly outperforming HTL. Moreover, ethanol solvent recycling maintained 35.16 % bio-oil yield after three reuse cycles (distillation and antioxidants required), exceeding conventional HTL conversion (67.72 %). This work establishes three advances: (1) K₂CO₃-ethanol synergy enables high-yield, low-nitrogen bio-oil; (2) Alkaline catalysis directionally removes N/S impurities; (3) Multi-cycle solvent reuse sustains efficient oil production, providing a sustainable pathway for wet waste valorization.

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利用k2co3催化溶剂热液化再生乙醇-水共溶剂从厨余垃圾中提取高品质低氮生物油。

厨房垃圾（KW）占城市固体废物的30% %- 60% %，可以通过碱催化溶剂热液化（STL）转化为生物油，而无需耗能干燥。本研究系统考察了6种催化剂（K2CO3、Na2CO3、KHCO3、NaHCO3、KOH、NaOH）对STL和水热液化（HTL）中产物分布和氮迁移的影响。结果表明，K2CO3在乙醇-水共溶剂中的优势，协同提高生物油收率至57.18 %（热值35.49 MJ/kg），同时实现定向反硝化——通过ph驱动的蛋白质脱酰胺将氮含量降低至22.99 wt%。硫化物分解后，硫含量降至0.13 wt%。关键是，该方法优化了生物油的组成：轻质组分（2co3 -乙醇协同作用）可获得高产、低氮的生物油；(2)碱催化定向脱除N/S杂质；(3)多循环溶剂再利用维持了高效的石油生产，为湿式废物增值提供了可持续的途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Bioresource Technology 工程技术-能源与燃料

CiteScore

20.80

自引率

19.30%

发文量

2013

审稿时长

12 days

期刊介绍： Bioresource Technology publishes original articles, review articles, case studies, and short communications covering the fundamentals, applications, and management of bioresource technology. The journal seeks to advance and disseminate knowledge across various areas related to biomass, biological waste treatment, bioenergy, biotransformations, bioresource systems analysis, and associated conversion or production technologies. Topics include: • Biofuels: liquid and gaseous biofuels production, modeling and economics • Bioprocesses and bioproducts: biocatalysis and fermentations • Biomass and feedstocks utilization: bioconversion of agro-industrial residues • Environmental protection: biological waste treatment • Thermochemical conversion of biomass: combustion, pyrolysis, gasification, catalysis.